fourth batch of perlpod(1) to mdoc(7) conversion

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diff --git a/src/lib/libcrypto/man/BN_copy.3 b/src/lib/libcrypto/man/BN_copy.3
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+.Dd $Mdocdate: February 23 2015 $
+.Dt BN_COPY 3
+.Os
+.Sh NAME
+.Nm BN_copy ,
+.Nm BN_dup
+.Nd copy BIGNUMs
+.Sh SYNOPSIS
+.In openssl/bn.h
+.Ft BIGNUM *
+.Fo BN_copy
+.Fa "BIGNUM *to"
+.Fa "const BIGNUM *from"
+.Fc
+.Ft BIGNUM *
+.Fo BN_dup
+.Fa "const BIGNUM *from"
+.Fc
+.Sh DESCRIPTION
+.Fn BN_copy
+copies
+.Fa from
+to
+.Fa to .
+.Fn BN_dup
+creates a new
+.Vt BIGNUM
+containing the value
+.Fa from .
+.Sh RETURN VALUES
+.Fn BN_copy
+returns
+.Fa to
+on success,
+.Dv NULL
+on error.
+.Fn BN_dup
+returns the new
+.Vt BIGNUM ,
+or
+.Dv NULL
+on error.
+The error codes can be obtained by
+.Xr ERR_get_error 3 .
+.Sh SEE ALSO
+.Xr bn 3 ,
+.Xr ERR_get_error 3
+.Sh HISTORY
+.Fn BN_copy
+and
+.Fn BN_dup
+are available in all versions of SSLeay and OpenSSL.